Merge "Make sure system bars have visible background while force-showing" into...

Merge "Make sure system bars have visible background while force-showing" into tm-qpr-dev am: b11f679d am: 338bfb7b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19193687



Change-Id: Iab0e6ec103fd66b67ab903af647368cce33335eb
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>